HW Virginis

HW Virginis

The HW Virginis system in Celestia.
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 44m 20.2387s[1]
Declination −08° 40′ 16.8486″[1]
Apparent magnitude (V) 10.69[2]
Characteristics
Spectral type sdB / dM[3]
Variable type eclipsing binary
Astrometry
Proper motion (μ) RA: 8.969±0.175[1] mas/yr
Dec.: −15.677±0.107[1] mas/yr
Parallax (π)5.7972 ± 0.0849 mas[1]
Distance563 ± 8 ly
(172 ± 3 pc)
Absolute magnitude (MV)4.22 (sdB) + 15.59 (dM)[4]
Absolute bolometric
magnitude
 (Mbol)
1.46 (sdB) + 11.20 (dM)[4]
Orbit[4]
Period (P)0.11671967 d
Semi-major axis (a)0.860 ± 0.010 R
Eccentricity (e)<0.0003
Inclination (i)80.98 ± 0.10°
Details[4]
sdB
Mass0.485 ± 0.013 M
Radius0.183 ± 0.026 R
Luminosity19.7 ± 5.6 L
Temperature28488 ± 208 K
dM
Mass0.142 ± 0.004 M
Radius0.175 ± 0.026 R
Luminosity0.003 ± 0.001 L
Temperature3084 ± 889 K
Other designations
BD−07 3477, HIP 62157, 2MASS J12442024-0840168[5]
Database references
SIMBADdata

HW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type), approximately 563 light-years away based on the parallax measured by the Gaia spacecraft,[1] in the constellation of Virgo. The system comprises an eclipsing B-type subdwarf star and red dwarf star. The two stars orbit each other every 0.116795 days.[6]

  1. ^ a b c d e f Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
  3. ^ Almeida, L. A.; Jablonski, F.; Tello, J.; Rodrigues, C. V. (2012). "A photometric and spectroscopic study of NSVS 14256825: The second sdOB+dM eclipsing binary". Monthly Notices of the Royal Astronomical Society. 423 (1): 478. arXiv:1203.1266. Bibcode:2012MNRAS.423..478A. doi:10.1111/j.1365-2966.2012.20891.x. S2CID 119177743.
  4. ^ a b c d Cite error: The named reference BrownSevilla was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  6. ^ Kiss, L. L.; Csák, B.; Szatmáry, K.; Furész, G.; Sziládi, K. (2000). "Spectrophotometry and period analysis of the sdB eclipsing binary HW Virginis". Astronomy and Astrophysics. 364: 199–204. arXiv:astro-ph/0010446. Bibcode:2000A&A...364..199K.